Hi.
Even if i don't reach the body fat level in which sfs give the best..since personal situation allow me to run only earl in the morning and i can' t eat anything...the last week i try yohimbine hcl...fat loss is definitively improved but running performance decreased...
Especially near lactate threshold. Is that normal? Something to fix that?

Lol. If you took the right dosage YOU will suffer. Not your performance.

Yohimbine is for walking or light cycling. Even the elliptical and stairmaster is difficult to do at a slow enough pace for yohimbine.

I tried the yohimbine/caffeine combination before physical training one time when I was in the military a few years ago. That was the hardest 2 mile run in my life; I damn near died with my heart beating out of my chest. What a dumb decision!